Bernee
®
6
/
8
（
1
）
Control line adopts twisted pair cable which is better than parallel line in transmission
distance.
（
2
）
Decoder adopts dual-core STP (shielded twisted pair) with RS485 communication. Cable
length should be within 1200m. Decoder can adopt chain connection or star connection. RS
＋（
A
）
,RS
－（
B
）
is signal end, connecting to A and B port of RS485 host (reverse connection
forbidden).
（
3
）
Multi decoders connection should be finished between the two farthest decoders, moreover
adding 120Ω resistor.
12. RS485 controlled device use method:
Wiring method: matrix switcher directly connects to decoder. PC can adopt active or passive
RS232-485 converter for connecting with decoder.
When distance over 1200m or interference excesses, it is necessary to install a RS485 repeater.
When adopting star
wiring, we’d better use RS485HUB which can turn 1 channel RS485 into 4
channels RS485. Thus all channels realize better isolation and less interference between each
other, besides effective transmission distance can also be lengthened.
When interference too serious or adopting non-twisted pair which leads to hard or disable control,
we should adopt RS485HUB or RS485 repeater suchlike devices.
13. Wiring Diagram:
RS+ (A) refers to RS485 plus communication; RS-(B) refers to RS485 minus communication.
DC12V and AC24V refer to the wiring terminal of power supply for camera.
AUX1 and AUX2 refer to the control switchers of camera power supply, wiper or light.